Q. 84.0( 4 Votes )

On one page of a telephone directory, there are 200 phone number. The frequency distribution of their units digits is given below:


One of the number is chosen at random from the page. What is the probability that the units digit of the chosen number is (i) 5? (8)?

Answer :

Total number of Numbers on a page: 200


Number of telephone Numbers which have 5 in its units place: 24


Number of telephone Numbers which have 8 in its units place: 16


Probability P() =


1.Let P(5) be probability of telephone number having 5 in the units place


P (5) =


P (5) = = 0.12


2.Let P(8) be probability of telephone number having 8 in units place P (8) =


P (8) = = 0.08


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